# Uloop Execute Dynamic Code

> Execute C# with Unity APIs when existing uloop tools cannot inspect or edit enough. Use for scene, prefab, SerializedObject, AssetDatabase refresh/.meta generation, menu, or PlayMode automation.

- Skill: `cyberagentgameentertainment/uloop-execute-dynamic-code` (Agent Skill, multi-file: 16 files)
- Install (CLI): `npx skillmds@latest add cyberagentgameentertainment/uloop-execute-dynamic-code`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberagentgameentertainment/uloop-execute-dynamic-code/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools, Web & Frontend
- Author: cyberagentgameentertainment (https://skillmd.com/u/cyberagentgameentertainment)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberagentgameentertainment/uloop-execute-dynamic-code

---


# Task

Execute the following request using `uloop execute-dynamic-code`: $ARGUMENTS

For basic selected GameObject discovery or property inspection, use `find-game-objects --search-mode Selected` before this tool. Use this tool after the built-in inspection tools are not enough or when you need to modify Unity state.

## Workflow

1. Read the relevant reference file(s) from the Code Examples section below
2. Construct C# code based on the reference examples
3. For multiline snippets, write the C# statements to a temporary `.csx` file and execute `uloop execute-dynamic-code --code-file <path>`
4. Use `uloop execute-dynamic-code --code '<code>'` only for short one-line snippets
5. If execution fails, adjust code and retry
6. Report the execution result

## Parameters

- `--code '<code>'`: Inline C# statements to execute. Use this for one-line snippets only.
- `--code-file <path>`: Read C# statements from a UTF-8 file. Prefer this for multiline snippets, especially on PowerShell, because Windows `.cmd` shims can lose lines from multiline inline arguments before `uloop` receives them.
- **Shell quoting**: bash/zsh uses single quotes, for example `uloop execute-dynamic-code --code 'using UnityEngine; return Mathf.PI;'`. PowerShell single-quoted strings can contain normal double quotes, for example `uloop execute-dynamic-code --code 'Debug.Log("Hello!");'`.
- `--parameters {}` (advanced, optional): Pass an object when reusing a snippet with varying data or when keeping values outside the code. Values are exposed as `parameters["param0"]`, `parameters["param1"]`, and so on. Omit this flag for most snippets, and pass an object instead of a JSON string.
- `--compile-only true` (optional): Compile the snippet without executing it. Use this when you want Roslyn diagnostics before running new code.

## Code Rules

Write direct statements only — no class/namespace/method wrappers. Return is optional.

```csharp
using UnityEngine;
float x = Mathf.PI;
return x;
```

**Forbidden** — these will be rejected at compile time: `System.IO.*`, `AssetDatabase.CreateFolder`, creating/editing `.cs`/`.asmdef` files. Use terminal commands for file operations instead.

## Output

Returns JSON:
- `Success`: boolean — overall execution success
- `Result`: string — value of the snippet's `return` statement (empty when omitted)
- `Logs`: string[] — execution diagnostics from the dynamic-code runner, not Unity Console entries
- `CompilationErrors`: object[] — Roslyn diagnostics with `Message`, `Line`, `Column`, `ErrorCode`, optional `Hint` and `Suggestions`
- `ErrorMessage`: string — top-level failure summary (empty on success)
- `Error`: string — alias of `ErrorMessage`
- `SecurityLevel`: string — dynamic-code security level active for the request
- `UpdatedCode`: string|null — the wrapped form actually compiled (handy when debugging using-statement reordering)
- `DiagnosticsSummary`: string|null — compact summary when diagnostics are available
- `Diagnostics`: object[] — structured diagnostics; same shape as `CompilationErrors`, usually populated together with it

Use `uloop get-logs` to retrieve `Debug.Log`, `Debug.LogWarning`, and `Debug.LogError` messages emitted by the snippet. On `Success: false`, inspect `CompilationErrors` first. If empty, read `ErrorMessage` (and `Logs` for extra context) — the failure may be a runtime exception, security violation, cancellation, or an "execution in progress" rejection, all of which return empty `CompilationErrors`. Both EditMode and PlayMode are supported targets — the snippet runs in whichever mode the Editor is currently in.

## Code Examples by Category

For detailed code examples, refer to these files:

- **Prefab operations**: See [references/prefab-operations.md](references/prefab-operations.md)
  - Create prefabs, instantiate, add components, modify properties
- **Material operations**: See [references/material-operations.md](references/material-operations.md)
  - Create materials, set shaders/textures, modify properties
- **Asset operations**: See [references/asset-operations.md](references/asset-operations.md)
  - Find/search assets, duplicate, move, rename, load
- **ScriptableObject**: See [references/scriptableobject.md](references/scriptableobject.md)
  - Create ScriptableObjects, modify with SerializedObject
- **Scene operations**: See [references/scene-operations.md](references/scene-operations.md)
  - Create/modify GameObjects, set parents, wire references, load scenes
- **Batch operations**: See [references/batch-operations.md](references/batch-operations.md)
  - Bulk modify objects, batch add/remove components, rename, layer/tag/material replacement
- **Cleanup operations**: See [references/cleanup-operations.md](references/cleanup-operations.md)
  - Detect broken scripts, missing references, unused materials, empty GameObjects
- **Undo operations**: See [references/undo-operations.md](references/undo-operations.md)
  - Undo-aware operations: RecordObject, AddComponent, SetParent, grouping
- **Selection operations**: See [references/selection-operations.md](references/selection-operations.md)
  - Get/set selection, multi-select, filter by type/editability
- **PlayMode automation (zsh)**: See [references/playmode-automation-zsh.md](references/playmode-automation-zsh.md)
  - Click UI buttons, invoke methods, set fields, tool combination workflows for zsh users
- **PlayMode automation (PowerShell)**: See [references/playmode-automation-powershell.md](references/playmode-automation-powershell.md)
  - Click UI buttons, invoke methods, set fields, tool combination workflows for PowerShell users
- **PlayMode UI controls**: See [references/playmode-ui-controls.md](references/playmode-ui-controls.md)
  - InputField, Slider, Toggle, Dropdown, drag & drop simulation, list all UI controls
- **PlayMode inspection**: See [references/playmode-inspection.md](references/playmode-inspection.md)
  - Scene info, game state via reflection, physics state, raycast checks, GameObject search, position/rotation